diff --git a/plugins/openvpn/openvpn_as_mtime b/plugins/openvpn/openvpn_as_mtime
index c92720f6..c260a598 100755
--- a/plugins/openvpn/openvpn_as_mtime
+++ b/plugins/openvpn/openvpn_as_mtime
@@ -72,7 +72,7 @@ for i in $LIST1; do
 done
 
 # If TOTU is 0, change to 1 for avoid problem in the division
-if [[ $TOTU -eq 0 ]]; then
+if [ "$TOTU" = "0" ]; then
         TOTU=1
 fi